Tube and conduit bending hand tool



Dec.21,1948

I B. LAMPERT TUBE AND CONDUI'L' BENDING HAND TO OL Filed June 14, 1945INVENTOR.

v a. LA-MPERT ATI'D RN EYS Patented Dec. 21, 1948 UNITED STATES PATENTOFFICE TUBE AND 'CONDUIT BENDING HAND TOOL Burnham Lampert, Sacramento,Calif. Application June 14, 1945, Serial No. 599,453

1 Claim.

The invention relates to a bending tool, and more especially to a tubeor pipe bending appliance.

The primary object of the invention is the provision of a device of thischaracter, wherein through hand actuation thereof, a tube or pipe can beuniformly bent, without kinking the same, or causing flattening thereof,the tube or pipe being securely held, and without liability of theslipping of either it or the device when in operation.

Another object of the invention is the provision of a device of thischaracter, wherein a tube, rod or pipe, or the like, can be successfullybent without removing it from a set position, and with dispatch, thedevice being of novel construction, and is unique in the workingthereof, so that it can be conveniently handled and applied and removedwith case.

A further object of the invention is the provision of a device of thischaracter, wherein it carries gripping jaws, which are locked inengaging position on a piece of work and will automatically open on therelease thereof.

A still further object of the invention is the provision of a device ofthis character, which is simple in construction, thoroughly reliable andefficient in operation, strong, durable, possessed of few parts, thesebeing readily accessible, the jaws susceptible of self-alignment withthe bending element of the device, readily and easily adjusted, andinexpensive to manufacture.

With these and other objects in view, the invention consists in thefeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described, illustrated in the accompanyingdrawing, which shows the preferred embodiment of the invention, andpointed out in the claim hereunto appended.

In the accompanying drawing:

Figure 1 is a side elevation of the device constructed in accordancewith the invention and applied to the work.

Figure 2 is an enlarged sectional view taken approximately on the line2-2 of Figure 1 looking in the direction of the arrows.

Figure 3 is a view similar to Figure 2 showing the jaws of the deviceopen.

Similar reference characters indicate corresponding parts throughout theseveral views in the drawing.

Referring to the drawing in detail, A designates generally a portion ofa pipe or tube, yet it may be a solid rod, or the like, while thebending tool or device in its entirety is denoted at B, constructed inaccordance with the invention.

The bending tool or device B, comprises a segmental shaped anvil orformer 10, having the arcuate grooved peripheral edge H to the size andshape of the pipe, tube or rod A to be bent.

At a point approximately medially of the anvil or former Ill, andradially disposed is built therewith a handle socket formation l2 fordetachably receiving a handle or lever l3, which is preferably engagedtherein by screw threads M.

At one end of the former or anvil m is a pivot lug l5 which is outwardlyhorned therefrom, and is fitted with a tap-nut id for the holding uponthe said pivot lug l5 a pair of opposed swinging jaws I! having thegripping hooks or claws I8 which on the closing of the jaws I! about thework embrace and firmly hold the pipe, tube, rod, or the like, A. Thesejaws I! are adapted to be spread apart by a coiled expansion spring H!interposed therebetween and seated at Zll in confronting edges of suchjaws, as best seen in Figure 3 of the drawing.

The jaws I! are limited in their spreading movements by a stop pin 2!coacting with abutment shoulders 22, respectively. The shoulders 22 areon the pivot eye ends 23 of the jaws 11, while the pin 2| is fixedlyprojected from the annular shoulder 24 of the lug l5 in the path of suchshoulders.

Loosely encircling the jaws ll is a locking collar or ring 25 which isadapted to be brought into wedging engagement with the rim portions 28exteriorly on the jaws next to the hooks or claws l8 thereof, so thatthe latter will be held in gripping engagement with the piece of work tobe bent, and this ring or collar 25 is slipped from its loose positionby hand from the narrower areas 21 of such jaws, as best seen in Figure3 of the drawing to that position shown in Figure 2 thereof. The jawsl'i have free movement on the pivot lug I5 so that they in themselveswill properly align with the former or anvil Ill when gripping the work,and the tool or device may be used to bend the work by inserting thelatter in the jaws I! and the grooved edge 5 i as such work is upon afloor or in a set position. The grooved edge ll of the anvil or formeriii enables the work to be supported against flattening, even though thework may leave the floor or the set position thereof.

The tool or device B is hand operated through the manipulation of thehandle or lever 13, as should be clearly obvious from the disclosure inthe drawing.

What is claimed is:

In a pipe bending tool, the combination of a segmental-shaped anvilhaving a peripheral groove adapted to receive a pipe, a radial socket onsaid anvil, a handle secured in said socket, a pivot lug extending fromsaid anvil in the plane thereof, swinging jaws pivoted on said lug formovement in a plane normal to the plane of said anvil, opposed grippingclaws having a curvature substantially equal to that of said peripheralgroove, said claws being formed on said jaws 4 opposed to each other andmovable in a common plane normal to the plane of said anvil for em-REFERENCES CITED bracing the pipe, a coiled expansion spring at- Thefollowing references are of record in the tached to and interposedbetween said jaws for file Of is Patent: moving the same away from eachother, a pin- 5 UNITED STATES PATENTS and-slot means on said Jaws forlimiting relative movement therebetween, means on said lug re- NumberName Date taining thereon said swinging jaws, a locking 739,252 AshbySept. 15,1903 collar slidably encircling the jaws for moving the110473480 Andfarson 17, 1912 same, and thereby the claws toward eachother 10 2333392 Lewm 1941- for frictionally locking the pipetherebetween.

BURNHAM LAMPERT.

